One of the real milestones in mobile listening, the Sony Walkman is getting an upgrade this summer. Last week, Sony released three new models: the NWZ-A860, NWZ-S760BT, and NWZ-E460 series. The A series is the high end model, featuring a 2.8 inch touch screen, bluetooth - which will allow it to stream audio from other devices - and an FM transmitter.  Battery life is said to clock in at 25 hours for music, and 5 hours for video playback. Two capacities will be available in the U.S.: an 8GB model for $179 and a 16GB version for $219. The E and S series are designed to be more mobile, with a smaller size and a battery life of 50 hours for music playback and 10 for video.  The are also priced lower than the A series, making them less of a liability. Read the full review over at CNET.

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